Journal
MATERIALS
Volume 10, Issue 8, Pages -Publisher
MDPI AG
DOI: 10.3390/ma10080967
Keywords
sericin; poly(vinyl alcohol); polyelectrolyte multilayers; AgNPs; antibacterial activity
Categories
Funding
- State Key Program of the National Natural Science of China [31530071]
- National Natural Science Foundation of China [31572465, 31402139, 31401048]
- Chongqing Research Program of Basic Research and Frontier Technology [cstc2015jcyjA00040, cstc2015jcyjBX0035, cstc2014jcyjA80007]
- Fundamental Research Funds for the Central Universities [XDJK2017D117, XDJK2017D187]
- Graduate Research and Innovation Project of Chongqing [CYS17081, CYS17076, CYB17069]
- Chongqing Engineering and Technology Research Center for Novel Silk Materials [silkgczx2016003]
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To develop silk sericin (SS) as a potential antibacterial biomaterial, a novel composite of polyelectrolyte multilayers (PEMs) coated sericin/poly(vinyl alcohol) (SS/PVA) film modified with silver nanoparticles (AgNPs) has been developed using a layer-by-layer assembly technique and ultraviolet-assisted AgNPs synthesis method. Ag ions were enriched by PEMs via the electrostatic attraction between Ag ions and PEMs, and then reduced to AgNPs in situ with the assistance of ultraviolet irradiation. PEMs facilitated the high-density growth of AgNPs and protected the synthesized AgNPs due to the formation of a 3D matrix, and thus endowed SS/PVA film with highly effective and durable antibacterial activity. Scanning electron microscopy, energy dispersive spectroscopy, X-ray diffractometry, Fourier transfer infrared spectroscopy, water contact angle, mechanical property and thermogravimetric analysis were applied to characterize SS/PVA, PEMs-SS/PVA and AgNPs-PEMs-SS/PVA films, respectively. AgNPs-PEMs-SS/PVA film has exhibited good mechanical performance, hydrophilicity, water absorption capability as well as excellent and durable antibacterial activity against Escherichia coli, Staphylococcus aureus and Pseudomonas aeruginosa and good stability and degradability. This study has developed a simple method to design and prepare AgNPs-PEMs-SS/PVA film for potential antibacterial application.
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